Gaya's 2025 population is now estimated at 623,751. In 1950, the population of Gaya was 131,585. Gaya has grown by 13,034 in the last year, which represents a 2.13% annual change.These population estimates and projections come from the latest revision of the UN World Urbanization Prospects. These estimates represent the Urban agglomeration of Gaya, which typically includes Gaya's population in addition to adjacent suburban areas.